I have a table with two columns like this:
\begin{tabularx}{\textwidth}{XX}
test & test \\
\multicolumn{2}{l}{test} \\
\end{tabularx}
However the multicolumn line does not function good (too close to the first line). Besides I read that \multicolumn should not cross any X columns.
What is the solution?

tabularenvironment? If one of these address your question, let us know. Regarding the cross ofX-columns:\multicolumndoesn't care about that. – Werner Jul 07 '13 at 16:59